Clock



FIG. 1 is a front, right, top perspective new of a clock, showing our new design;

FIG. 2 is a front elevation view thereof,

FIG. 3 is a top view thereof,

FIG. 4 is a rear elevation view thereof,

FIG. 5 is a left side view thereof,

FIG. 6 is a bottom elevation view thereof; and,

FIG. 7 is a right side view thereof. 

The ornamental design for a clock, as shown and described. 